Blade for paper punches

Abstract

A blade for paper punches includes a hollow tubular body with a passage defined axially therethrough and an inclined edge is defined in a lower end of the body. An angle between the inclined edge and a stack of paper sheet is in a range between 15 to 50 degrees. A spring is located in the passage of the body so as to bias a push rod which is movable in the passage to remove debris from the passage.

1 . A blade for paper punches comprising:
 a hollow tubular body with a passage defined axially therethrough and an inclined edge defined in a lower end of the body.   
     
     
         2 . The blade as claimed in  claim 1 , wherein an angle between the inclined edge and a stack of paper sheet is in a range between 15 to 50 degrees. 
     
     
         3 . The blade as claimed in  claim 1 , wherein a spring is located in the passage of the body and biases a push rod which is movable in the passage. 
     
     
         4 . The blade as claimed in  claim 3 , wherein a stepped shoulder is defined in an inner periphery of the passage and the push rod has one end stopped by the stepped shoulder. 
     
     
         5 . The blade as claimed in  claim 4 , wherein the body includes a release hole defined in the lower end of the body and located beneath the stepped shoulder.